Garden Bathtub Clay amendment

Hi all been working on a new garden project, new garden is clay and
wet!
I rotavated and amended the lawn area several weeks ago and turf is
growing and rooting great however I decided to dig over the beds with a
view to remove the substantial builders rubble and heaviest clay lumps
Bed is around 1.5mx9m by around 300/350mm deep
After some rain last night I came down to find the empty end of bed FULL
of water like a bathtub the full 350mm deep 24hrs after raining, must be
seeping in from other parts given it's now the lowest part.
What should I do? The worst bit is the empty part so as there is no
resistance there water is flooding im but what if i follow my original
plan to level out the remaining clay soil and mix it back into the bed
with 1-2 tonne compost?
Or...
Am I doomed here now and need drainage solution to reroute which is not
ideal
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Apply a generous amount of gypsum (calcium sulfate) over your entire
garden. A layer 1-2 cm would be about correct for a start. Lightly wet
it down so that the wind does not disperse it. If you get some rain,
that would be good because it needs to be dissolved and rinsed into the
soil. Without rain, you need to lightly water it about once every three
days until you do not see it. Repeat this treatment once over your
entire garden. Then repeat it at least two more times in the areas that
tend to have the worst drainage.
Gypsum reacts chemically with clay, making it granular and porous. That
improves drainage. Unfortunately, you might have to give another
treatment at least annually.
Another thing to consider is adding peat moss when you "rotavate" (which
we call "rototill" in the U.S.). Unlike many other organic amendments,
peat moss decomposes very slowly. For your worst soil, try tilling
about a 15 cm layer of peat moss to a depth of 30 cm.
DO NOT add sand to your clay. Adding sand to clay is equivalent to
adding gravel to cement to make concrete.
In the end, you might have to make a dry well at the lowest end of your
garden.

for a poorly drained area if you have no
alternative you can dig it out so that it will
fill during your worst storms and then use it
to plant a low growing and water loving plant.
this is the cheapest method considering what
it may take to put in a drain or all the other
suggestions for amending.
creeping jenny works for me to cover a low
area, but it looks nice if kept weeded otherwise
the taller weeds will eventually take over.
except it may be considered invasive and spread
so... i don't mind mine spreading. if it gets
to be too much i'll just use it as a mulch. it's
not gotten that far yet. :)
i started with just a few cuttings and then
kept taking more chunks as it grew to fill in the
area. it took a few years to get the whole area
covered. i have to spend a few hours here or there
to weed it, but as it has filled in the weeding
goes much more quickly.
grasses are the biggest pains in the ass.
the suggestion of a dry well could also work but
is more expensive because you need a large enough
container and grate of some kind.
songbird

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